Mechanisms of Strength and Toughness in a Microalloyed, Precipitation Hardened Steel

Abstract

The microstructural parameters contributing to the strength and toughness of low carbon, microalloyed, precipitation hardenable steels were identified in two ASTM A710, grade A, 50 mm thick plates in the reaustenitized, quenched and aged condition. Tensile, impact toughness and fracture toughness properties were determined over a full range of test temperatures to characterize the mechanical behavior and the fracture processes in the fracture mode transition temperature region, especially as related to cleavage failure and cracking parallel to the loading direction (longitudinal cracking). Microstructural and fractographic characterization, carbide precipitates (in the longitudinal direction) and a non-homogeneous grain size distribution as the primary contributing factors to lower toughness, while copper precipitation played a large role in strengthening. Keywords: HSLA steel, Structure/property relationship, Fracture characteristics, Physical metallurgy.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1989
Accession Number
ADA210571

Entities

People

  • M. E. Natishan

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Synthesis
  • Chemistry
  • Crystal Structure
  • Ductile Brittle Transition
  • Failure Mode And Effect Analysis
  • Geometry
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Metallurgy
  • Solid Solutions
  • Tensile Properties
  • Tensile Strength
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy